yahoo-eng-team team mailing list archive

[Augustina Ragwitz <1528756@xxxxxxxxxxxxxxxxxx>]

Juno is EOL [1] so we aren't doing fixes for it anymore. I've cosed this
as invalid, but if you still have this issue in a later, supported
release, please feel free to reopen this issue and provide the updated
version details of your environment in the description.

References:
--------------
[1] http://docs.openstack.org/releases/

** Changed in: nova
     Assignee: Elhay Efrat (elhayefrat) => (unassigned)

** Tags removed: volumes

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1528756

Title:
  nova instance was read-only mode

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Our Openstack brief Information & Issue

  1. Version : Juno

  2. Management(Nova, CInder, LB etc) & Compute Node OS ver : Ubuntu
  14.04

  3. H/W Model
   - Management Server : Dell R720
   - Compute Node : HP C7000 (Blade 460C *6ea)
   - Storage : Netapp FAS 8020
   - Switch : Nexus 4568

  4. Issues
   - nova instance was read-only mode.
   - then we did reboot all instances except for Bootable Volume Instances.
   - I have thought that the NAS volume what have nova instance images temporarily disconnected.

  there are two Instance type we have
   1) First type instance(OS) is launched from nfs (glance images)
   2) Second is installed by cinder volume (Bootable Volume OS)

  5. cause analysis
   - After Rebooting instances, all instances were normal status.
   - But there were no logs about NFS N/W disconnection in Compute Node, Storage, Switch.
   -  And no Performance Issues (CPU, MEM, Disk IO, N/W traffic)

   - VM kernel I/O Error log
  kernel: end_request: I/O error, dev vda, sector 12523664
  kernel: Buffer I/O error on device dm-1, logical block 388370
  kernel: lost page write due to I/O error on dm-1
  kernel: end_request: I/O error, dev vda, sector 36124456
  kernel: Buffer I/O error on device dm-1, logical block 3338469
  kernel: lost page write due to I/O error on dm-1

  6. etc
  - nfs client version
  # dpkg -l |grep nfs
  ii  libnfsidmap2:amd64                    0.25-5                                amd64        NFS idmapping library
  ii  nfs-common                            1:1.2.8-6ubuntu1.1                    amd64        NFS support files common to client and server

  What is causing NFS temporary disconnection?

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